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9b45aa0bd58cd9e8478abffafa792e1e53feed08 by Abseil Team <absl-team@google.com>:

Document that command line flag help for a flag will include the default value.
Cleaned up the doc for undefok.

PiperOrigin-RevId: 335701801
GitOrigin-RevId: 9b45aa0bd58cd9e8478abffafa792e1e53feed08
Change-Id: I435e240bd10bf6a232a95f220cab83c41701ecb6